Bert,
The foam may expand and push the wall both inside and outside. See if
you can get the foam that has minimal expansion. This is used for
window and door caulking.
bill
Prez WDCU
> Hooked our 1957 Caravanner up yesterday and found only half of the exterior
> lights working. While investigating I found eaten wires and a HUGE pile
> (picture a half deflated basketball) of pink insulation. I believe that the
> insulation was pulled out of the wall cavity at the front of the trailer. I
> also believe that the mice responsible for this mess have entered the
> trailer via the space around the water system drain. Two questions.
>
> 1) After I have fixed the wiring, is there any problem using expandable
> (squirt in) insulation foam to re-fill the cavity left in the wall?
>
> 2) Are there any reasons not to use the same foam around the drain faucet
> on the underside of the trailer to seal the entry point?